Archery bow with variable strength adjusting means

ABSTRACT

An archery bow comprising a frame member having a left half and a right half, first and second arm members pivotally attached at one end to said left and right halves, the arms being of equal length and attached equidistant from the outer ends of the left and right halves of the frame, a bowstring connecting the unattached ends of the first and second arms, means resiliently connecting the unattached ends of the first and second arms to the outer end portion of the left and right halves respectively, whereby when the bowstring is drawn, the resilient connecting means are distended.

O Umted States Patent 1111 3,552,373

[72] Inventor JeromeM.Van Hecke 5 R ference Cited Magma UNITED STATESPATENTS [21] P 586,713 7/1897 Peters 124/24 [221 Ned 1 932 195 10/1933Strou p... 124/22 [451 paemed 1971 2 714 377 8/1955 Mulke 124/24Assignees w. Boswe" y Waldo, Ark. Primary Examiner-George .l. Marlo apart interest to each; Assistant Examiner-William R. Browne C.C. Sigle vAttorney-Shlesinger, Arkwright & Garvey Waldo, Ark. a part interest toeach ABSTRACT: An archery bow comprising a frame member having a lefthalf and a right half, first and second arm members pivotally attachedat one end to said left and right halves, the arms being of equal lengthand attached equidistant from [54] VARIABLE STRENGTH the outer ends ofthe left and right halves of the frame, a 5 claims Drawing Figsbowstring connecting the unattached ends of the first and second arms,means resiliently connecting the unattached [52] US. Cl.. 124/ ends ofthe first and second arms to the outer end portion of F41b5/00 the leftand right halves respectively, whereby when the [50] Field ofSearch124/24, 23, bowstring is drawn, the resilient con ecting means are 22,25 distended.

PATENTEUJAN SIB?! 3552.373

Jerome Von.//ecK WWW r 9 4/ ATTORNEYS ARCHERY BOW WITH VARIABLE STRENGTHADJUSTING MEANS BACKGROUND The present invention relates to an archerybow of new and novel construction, and includes a means whereby thetension on the bowstring, and thus the power of the bow may be easilyadjusted.

Prior art bows have constructionswhereby the power of a bow might beadjusted by various means such as springs and the like. Most of thesedevices have been somewhat awkward, and the accuracy of the bow has beenlimited to some extent by this awkwardness.

OBJECTS OF THE INVENTION It is therefore a primary object of thisinvention to provide a bow of new and novel construction.

A further object of this invention is to provide a novel bowconstruction including a novel means for adjusting the power of a bow tosuit the archers strength.

Still another object of this invention is to provide a bow wherein themeans for adjusting the pull of the bow does not interfere with thearcher.

Another object of this invention is to provide a bow wherein theadjustment may be easily accomplished.

These and other objects and advantages of this invention will beapparent from the following description and claims.

DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the bow of thisinvention showing in dotted lines the position of the various bowmembers when the bow is drawn.

FIG. 2 is a fragmentary elevational view of the pivotal arm of the bow.

FIG. 3 is a fragmentary plan view of the joint structure of the pivotalarm taken along lines 3-3 of FIG. 2.

FIG. 4 is a fragmentary view of the resilient members connecting thearms and the frame.

DESCRIPTION OF THE INVENTION In FIG. I, 2 designates the frame member ofthe bow having left half portion 4 and right half 6. The left half 4 hasan outer end portion 8, and the right half 6 has an outer end portion10. Frame member 2 includes a handgrip portion 12 of a type known in theart, and may also include an arrow rest 14.

Pivotally attached to left half 4 at point 16 is arm member 18, andattached in a like manner to the right half 6 at point 20 is right armmember 22. At the unattached end of arms I8 and 22 are a plurality ofnotches 24 and 26 respectively. Near the outer end 8 of the left half ofthe frame member 4 are a plurality of notches 28 and correspondingly atthe outer end 10 of the right half 6 of the frame member are a pluralityof notches 30.

Connecting the unattached ends of arms 18 and 22 is a bowstring 32 ofthe type generally known in the art. Connecting the unattached ends ofarms 18 and 22 with the outer ends 8 and I of left and right halves, 4and 6, of frame member 2 are resilient members 34 and 36. These membersmay be of any suitable construction such as an ordinary rubberband, orthey may be a piece of endless resilient tubing. An alternate structurefor these resilient members is illustrated in FIG. 4 and this embodimentfeatures a means by which two straight pieces of rubber tubing 38 may beattached to a loop 40 which loop would pass around the bow frame members8 and or arms 18 and 22. The connection is made by means of a ball 42inserted within the ends of tubes 38, and the tubing being tied aroundthe loop 40 as shown at 44. It is obvious that this is only one possiblemeans for securing these resilient members, and this application isintended to cover all possible modes by which said members are attached.

In FIG. 3 is illustrated one possible means by which arm member 22 ispivotally attached to the right half 6 of frame member 2. The pivotedend of arm 22 is bifurcated and provided with furcations 44 on eitherside of web member 46 which is formed integrally with frame member 6. Apivot pin 20 is passed through members 44 and 46 for'securing thesemembers in a pivotal relationship. A stop 49 is provided to limit theextent to which the bow may be drawn.

As is best seen in FIG. 2, the point of contact between arm 22 and frameportion 6 is a bearing surface 48. This is provided to prevent wearwhich may'otherwise occur at this point.

ADJUSTMENT PROCEDURE Also seen in FIG. 2 is the novel means by which thepower or pull of the bow may be adjusted. By varying the position of theresilient member 36 in notches 26 and 30, a large amount of variation ofthe pull of the bow may be obtained. With the resilient member 36attached at the point shown on arm 22, the angle of the resilient membermay be varied between Angle l and Angle 2 as shown. With the member 36positioned at Angle I, the greatest amount of pull will be obtained,while if the position is varied to Angle 2, the pull of the bow will beat a minimum. Thus when resilient member 36 is attached at the outermostnotch 26 of arm 22, and the innermost notch 30 of frame member 10, theleast amount of pull for the bow will be obtained. Conversely, when theresilient member 36 is positioned between the innermost notch 26 of thearm 22 and the outermost notch 30 of frame member 10, the greatestamount of pull of the how will be obtained.

Obviously, the pull of the bow may be varied even more by changingeither the length or strength of resilient member 36.

As shown in the dotted line portion of FIG. 1, when an arrow 50 isplaced in the proper position with respect to the bow, and the bowstring32 is drawn, resilient members 34 and 36 are distended. Thus the powerof the bow is determined by the position and structure of resilientmembers 34 and 36. These resilient members may be of natural rubber, anyvariety of synthetic material, or may even include springs. Any of thesemodifications would come within the perview of this application.

While the invention has been described in connection with differentembodiments thereof, it will be understood that it is capable of furthermodification, and this application is intended to cover any variation,uses, or adaptations of the inventions following in general, theprinciples of the invention and including such departures from thepresent disclosure as come within known or customary practices in theart to which the invention pertains, and as may be applied to theessential features hereinbefore set forth and as fall within the scopeof the invention or the limits of the appended claims.

I claim: I

I. An archery bow comprising:

a. a frame member having a left half having an outer end portion and aright half having an outer end portion;

b. a first arm pivotally attached at one end to said left half;

. c. a second arm pivotally attached at one end to said right half;

d: said first and second arms being of equal length and at tachedequidistant from said outer end portions of said left and right halves;

e. a bowstring connecting the unattached ends of said first and secondarms; I

f. means resiliently connecting the unattached end of said first arm tosaid outer end portion of said left half;

g. means resiliently connecting the unattached end of said second arm tosaid outer end portion of said right half.

h. whereby when said bowstring is drawn, said resilient connecting meansare distended;

i. means for adjusting the tension of said bow string;

j. a plurality of means near said outer end portion of said left halfframe member for adjustably receiving and retaining said resilientconnecting means;

k. a plurality of means near said outer end portion of said right framemember for adjustably receiving and retaining said resilient connectingmeans; and

l. a plurality of means near said unattached ends of said first andsecond arms for adjustably receiving and retaining said resilientconnecting means.

2. An archery bow as in claim 1 and wherein:

a each of said first and second arms is attached to said left and rightframe halves by means of a pivot pin passing through said arms and saidframe halves; and

b. said arms contact said frame halves at bearing surfaces.

connecting means being positionable between a notch on said arm and anotch on the adjacent frame half.

1. An archery bow comprising: a. a frame member having a left halfhaving an outer end portion and a right half having an outer endportion; b. a first arm pivotally attached at one end to said left half;c. a second arm pivotally attached at one end to said right half; d.said first and second arms being of equal length and attachedequidistant from said outer end portions of said left and right halves;e. a bowstring connecting the unattached ends of said first and secondarms; f. means resiliently connecting the unattached end of said firstarm To said outer end portion of said left half; g. means resilientlyconnecting the unattached end of said second arm to said outer endportion of said right half, h. whereby when said bowstring is drawn,said resilient connecting means are distended; i. means for adjustingthe tension of said bow string; j. a plurality of means near said outerend portion of said left half frame member for adjustably receiving andretaining said resilient connecting means; k. a plurality of means nearsaid outer end portion of said right frame member for adjustablyreceiving and retaining said resilient connecting means; and l. aplurality of means near said unattached ends of said first and secondarms for adjustably receiving and retaining said resilient connectingmeans.
 2. An archery bow as in claim 1 and wherein: a. each of saidfirst and second arms is attached to said left and right frame halves bymeans of a pivot pin passing through said arms and said frame halves;and b. said arms contact said frame halves at bearing surfaces.
 3. Anarchery bow as in claim 2 and wherein each of said first and second armsis positioned within a recess in said left and right frame halves.
 4. Anarchery bow as in claim 1 and wherein said means for adjustablyreceiving and retaining said resilient means includes notches.
 5. Anarchery bow as in claim 4 and wherein said resilient connecting meansbeing positionable between a notch on said arm and a notch on theadjacent frame half.